The incident happened outside the club on Harcourt Street at about midnight.

Gardaí say around 1,500 people were queuing outside the nightclub at the time.

The club was running a night called 'Messy Mondays', in which all drinks are €3.50, according to its Facebook page.

Four of the injured were taken to hospital emergency departments for treatment.

Harcourt Street was closed off for a time after the incident but has since reopened.

In a statement, Copper Face Jacks said: "We refer to the incident that occurred last night at the junction of Camden Place and Harcourt Street, as a result of which a number of people were injured.

"We are working closely with all relevant authorities to establish the cause of this incident.

"The safety and wellbeing of our patrons is paramount at all times, and at present our major concern is for the people who were caught up in the incident and particularly those who were injured."

Minister for Children and Youth Affairs Frances Fitzgerald said: "The incident raised public health and safety issues regarding overcrowding outside venues that should be addressed urgently by venue owners in collaboration with the gardaí, fire services and local authorities.

"The last thing a young person going out for a night expects is to be traumatised or injured or to have the kind of experience that apparently happened last night.

"There are public safety implications that we need to examine in respect of this incident. I also have concerns in respect of venues which attract large gatherings as a result of alcohol promotions."